Polarographic sensor
Abstract
Abstract A POLAROGRAPHIC SENSOR COMPRISING A PAIR OF ELECTRODES JOINED BY AN ELECTOLYTE WITH INNER AND OUTER MEMBRANES SEPARATING THE ELECTRODE AND ELECTROLYTE FROM THE SAMPLE MEDIUM. THE OUTER MEMBRANE IS PERMEABLE TO THE GAS BEING DETERMINED AND IMPERMEABLE TO ELECTROLYTE WHILE THE INNER MEMBRANE HAS AN OPENING THEREIN WHICH OVERLIES THE SENSING ELECTRODE OF THE SENSOR. THIS INNER MEMBRANE IS SUBSTANTIALLY LESS PERMEABLE TO THE GAS BEING ANALYZED THAN THE OUTER MEMBRANE AND IS HYDROPHILIC SO AS TO RETAIN A FILM OF ELECTROLYTE BETWEEN THE OUTER MEMBRANE AND THE ELECTRODES. PREFERABLY THE OUTER MEMBRANE IS FORMED OF POLYTETRAFLUOROETHYLENE AND THE INNER MEMBRANE OF POLYETHYLENE TEREPHTHALATE (MYLAR). D R A W I N G
Inventors
- 👤 James C Sternberg
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |